NATURE AND SIGNIFICANCE 



231 



As is suggested by these examples, life form may sometimes be used to 

 separate subdivisions of the biome, both in the sea and on land. 



In general, among the more motile animals, life habit is the prac- 

 tical equivalent of life form in sessile animals and plants. The form 

 characters of motile animals of the same life habit differ so greatly 

 as to render form of doubtful significance. The life habit character- 

 istics usually must be brought out by statistics, as shown in Table 9. 

 Such statistics bring out specific differences, but do not take into ac- 

 count quantity or potency. 



Convergence in North-Central Indiana 



Tests of a Climax. The essence of a climax is found in its relation 

 as effect to the climate as cause, typically expressed on land in a single 

 life form for dominants. The nature and unity of a biome are also 



